TY  - RPRT
TI  - Some efficiency comments on group sizes in study design.
AU  - J H Lubin
PY  - 1980
DO  - 10.1093/oxfordjournals.aje.a112921
UR  - https://pubmed.ncbi.nlm.nih.gov/7377188/
ID  - 7377188
ER  -